l十3十5十7十8⋯十99= (1十3十5十7…:.…十99)一(2十4十6十8……十98...
l\u53413\u53415\u53417\u5341\u2026l99\u600e\u4e48\u8ba1\u7b97\uff08\u9996\u9879+\u5c3e\u9879\uff09\u00d7\u9879\u6570\u00f72
\uff081+99\uff09\u00d750\u00f72=2500
(1\u53413\u53415\u53417\u2026:.\u2026\u534199)\u4e00(2\u53414\u53416\u53418\u2026\u2026\u534198)
=\uff0899-98\uff09+\uff0897-96\uff09+---+\uff083-2\uff09+1\uff0c\u5171\u670950\u9879
=50
=((1十3十5十7十9十⋯⋯十99)十(1十3十5十7十9十⋯⋯十99))÷ 2
=((1十99)十(3十97)十(5十95)十⋯⋯十(99十1))÷ 2
= 100 x 50 ÷ 2
= 2500
绛旓細1鍗3鍗5鍗7鍗9鍗⋯⋯鍗99 锛濓紙锛1鍗3鍗5鍗7鍗9鍗⋯⋯鍗99锛夊崄锛1鍗3鍗5鍗7鍗9鍗⋯⋯鍗99锛夛級梅 2 锛濓紙锛1鍗99锛夊崄锛3鍗97锛夊崄锛5鍗95锛夊崄⋯⋯鍗侊紙99鍗1锛夛級梅 2 锛 100 x 50 梅 2 锛 2500 ...
绛旓細1鍗3鍗5鍗7鍗9鍗⋯鍗95鍗97鍗99=2500锛2+4+6+8+10+鈥+96+98+100=1+1+3+1+5+1鈥︹︼紙杩欓噷鍏跺疄灏辨槸鎶2鍒嗘垚1鍜1鐩稿姞锛4鍒嗘垚3鍜1鐩稿姞锛6鍒嗘垚5鍜1鐩稿姞锛屽悗闈㈢殑浠ユ绫绘帹锛=1鍗3鍗5鍗7鍗9鍗⋯鍗95鍗97鍗99+1鈥︹+1锛堣繖閲屽叡鐢50涓1锛=2500+50=2550.杩樺彲浠ヨ繖鏍锋眰锛2...
绛旓細璁$畻 1鍗3鍗5鍗7鍗鈥︹+鍗2015鍗2017 =锛1+2017锛壝1009梅2 =2018脳1009梅2 =1009脳1009 =1018081
绛旓細1008 鎶婃嫭鍙峰幓鎺夛紝鐒跺悗鏁翠釜绠楀紡鐪嬫垚2-1+4-3.銆傘傘+2016-2015 鏈鍚庣畻鍑烘湁鍑犱釜1灏辫浜
绛旓細2+4+6+8+鈥+196+198=(2+198)+(4+196)+鈥+(98+102)+100=48x200+100=9700 1+3+5+鈥+195+197=1+3+5+鈥+195+197+199-199=(1+199)+(3+197)+鈥+(99+101)-199=49x200-199=9800-199 (2+4+6+8+...+196+198)-(1+3+5+...+195+197)=9700-(9800-199)=99 ...
绛旓細, 3 17浣犳妸寮澶村拰缁撳熬鐨勬暟瀛楀姞璧锋潵.., 5 15锛屽氨鏄1 19锛屽緱鍑100.杩欐牱涓嬪幓, 鏄庣櫧鍚
绛旓細鎶1鎸変綇锛屽悗闈袱涓暟涓や釜鏁扮殑鐪嬶紝灏辨槸1+1+1+1+1+1鍟
绛旓細1鍗1鍗3鍗5鍗6鍗7鍗8鍗9鍗2鍗8 =(1+9)+(3+7)+(2+8)+(1+6+8+5)=10+10+10+20 =50
绛旓細鈪狅紞1 銆佲叀锛2銆佲參锛3銆佲叄锛4銆佲叅锛5 鈪ワ紞6銆佲叇锛7銆佲収锛8銆佲叏锛9銆佲叐锛10 缃楅┈鏁板瓧鏄娲插湪闃挎媺浼暟瀛楋紙瀹為檯涓婃槸鍗板害鏁板瓧锛変紶鍏ヤ箣鍓嶄娇鐢ㄧ殑涓绉嶆暟鐮侊紝鐜板湪搴旂敤杈冨皯銆傚畠 鐨勪骇鐢熸櫄浜庝腑鍥界敳楠ㄦ枃涓殑鏁扮爜锛屾洿鏅氫簬鍩冨強浜虹殑鍗佽繘鍒舵暟瀛椼備絾鏄紝瀹冪殑浜х敓鏍囧織鐫涓绉嶅彜浠f枃 鏄庣殑杩涙銆2015骞7鏈堬紝...
绛旓細鎶婏紝1锛2锛3锛4锛5锛6锛7锛8杩8涓暟鍒嗗埆濉叆鏂规涓紝姣忎釜鏁板彧鑳界敤涓娆 鍙e崄鍙o紳鍙e崄鍙o紳鍙e崄鍙 鎶婏紝1锛2锛3锛4锛5锛6锛7锛8杩8涓暟鍒嗗埆濉叆鏂规涓紝姣忎釜鏁板彧鑳界敤涓娆★紝杩欎釜闂娌℃湁琛ㄨ揪娓呮锛屾墍浠ュ彲浠ヨ繖鏍峰~锛1鍗2锛3鍗4锛7鍗5 杩樺彲浠ヨ繖鏍峰~锛1鍗8=2+7=3鍗6 ...